655651 has 2 divisors, whose sum is σ = 655652. Its totient is φ = 655650.

The previous prime is 655649. The next prime is 655657. The reversal of 655651 is 156556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655651 - 2¹ = 655649 is a prime.

Together with 655649, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327825 + 327826.

It is an arithmetic number, because the mean of its divisors is an integer number (327826).

2⁶⁵⁵⁶⁵¹ is an apocalyptic number.

655651 is a deficient number, since it is larger than the sum of its proper divisors (1).

655651 is an equidigital number, since it uses as much as digits as its factorization.

655651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 28.

The square root of 655651 is about 809.7227920715. The cubic root of 655651 is about 86.8742182011.

The spelling of 655651 in words is "six hundred fifty-five thousand, six hundred fifty-one".